thats right i said it, being this is a hypothetical situation, im assuming you could only drink one type of beer for eternity, so iwent with the most neutral, clean tasting beer that you would never get sick of. (i never tire of drinking water, nor will i ever)

my first choice was Chimay, but eventually, your palate might be so attuned to drinking it, that every off flavor will be magnified, and eventually it would become undrinkable...(i realize that certain monks only drink one type of beer)